See Spoiler on Wikipedia. The first paragraph from the article; Spoiler is Genex slang for any element of any summary or description of any piece of fiction that reveals any plot element which will give away the outcome of a dramatic episode within the work of fiction, or the conclusion of the entire work. Because enjoyment of fiction sometimes depends upon the dramatic tension and suspense which arise within it, the external revelation of such plot elements can "spoil" the enjoyment that some consumers of the narrative would otherwise have experienced.